It used to be that when you rented a movie from Apple's iTunes service, you'd have 24 hours to finish watching it. You could start streaming the rental within 30 days of purchase, of course. Just a couple of weeks after Apple made 4K an affordable option, the company has doubled the rental time to 48 hours. This is perfect for those of us with young kids who want to watch a movie over (and over and over) or busy schedules that don't let us get to our movies right away. The timer starts even if you're watching the film offline, too.